> because they're helping the cause by forcing all resources to be focused on one target

This might work for company-backed projects but not for OSS enthusiasts and power users - they will leave for greener pastures. For example, Linux Mint lives off the manpower that GNOME 3 drove away, Void and Alpine Linux live off the manpower that systemd drove away. There will be some ecosystem that will live off the manpower that Wayland drives away.